1 Cov teeb meem tshwm sim hauv phab ntsa putty hmoov:
(1) Dries sai.
Qhov no feem ntau yog vim tias cov hmoov tshauv calcium ntxiv (loj heev, cov hmoov tshauv calcium hmoov siv hauv cov mis putty tuaj yeem txo qis kom tsim nyog) muaj feem xyuam rau cov dej tuav tus nqi ntawm cov fiber ntau, thiab nws kuj muaj feem xyuam rau cov dryness. ntawm phab ntsa.
(2) Tev thiab yob.
Qhov no muaj feem xyuam rau cov dej tuav tus nqi, uas yog ib qho yooj yim tshwm sim thaum lub viscosity ntawm cellulose yog tsawg los yog tus nqi ntawm ntxiv me me.
(3) De-powder ntawm sab hauv phab ntsa putty hmoov.
Qhov no muaj feem xyuam rau cov hmoov tshauv calcium ntxiv (cov hmoov tshauv calcium hmoov nyob rau hauv cov mis putty tsawg dhau los yog purity ntawm cov hmoov tshauv calcium hmoov tsawg dhau lawm, thiab cov hmoov tshauv calcium hmoov nyob rau hauv cov hmoov putty hmoov yuav tsum. kom tsim nyog nce), thiab nws kuj tseem cuam tshuam nrog ntxiv ntawm cellulose. Muaj kev sib raug zoo ntawm qhov muaj nuj nqis thiab qhov zoo, uas tau cuam tshuam rau hauv cov dej tuav tus nqi ntawm cov khoom. Cov dej tuav qis qis, thiab cov hmoov tshauv calcium hmoov (cov calcium oxide hauv cov hmoov tshauv calcium hmoov tsis tag nrho hloov mus rau calcium hydroxide rau hydration) lub sij hawm tsis txaus, uas yog tshwm sim.
(4) Blistering.
Qhov no muaj feem xyuam rau cov av qhuav thiab flatness ntawm phab ntsa, thiab nws kuj muaj feem xyuam rau kev tsim kho.
(5) Pinpoints tshwm.
Qhov no muaj feem xyuam rau cellulose, uas muaj cov yeeb yaj kiab tsis zoo. Nyob rau tib lub sij hawm, cov impurities nyob rau hauv cellulose react me ntsis nrog tshauv calcium. Yog tias qhov tshuaj tiv thaiv hnyav, cov hmoov putty yuav tshwm sim hauv lub xeev ntawm taum curd residue. Nws tsis tuaj yeem muab tso rau ntawm phab ntsa, thiab nws tsis muaj lub zog cohesive tib lub sijhawm. Tsis tas li ntawd, qhov xwm txheej no kuj tshwm sim nrog cov khoom xws li carboxyl pawg ntxiv rau cov cellulose.
(6) Volcanic qhov thiab pinholes tshwm.
Qhov no yog pom tseeb muaj feem xyuam rau cov dej nto nro ntawm hydroxypropyl methylcellulose aqueous kua. Lub rooj dej nro ntawm hydroxyethyl aqueous tov tsis pom tseeb. Nws yuav zoo los ua qhov kev kho kom tiav.
(7) Tom qab cov putty dries, nws yog ib qho yooj yim rau tawg thiab tig daj.
Qhov no muaj feem xyuam rau qhov sib ntxiv ntawm ntau cov hmoov tshauv-calcium hmoov. Yog tias cov hmoov tshauv-calcium ntxiv ntau dhau lawm, qhov nyuaj ntawm cov hmoov putty yuav nce ntxiv tom qab ziab. Yog tias cov hmoov putty tsis muaj qhov hloov pauv, nws yuav tawg yooj yim, tshwj xeeb tshaj yog thaum nws raug rau sab nraud quab yuam. Nws kuj tseem muaj feem xyuam rau cov ntsiab lus siab ntawm calcium oxide hauv cov hmoov tshauv calcium hmoov, uas tau qhia ua ntej.
2 Vim li cas cov hmoov putty ua nyias dua tom qab ntxiv dej?
Cellulose yog siv los ua thickener thiab dej-retaining tus neeg sawv cev nyob rau hauv lub putty. Vim yog thixotropy ntawm cellulose nws tus kheej, qhov sib ntxiv ntawm cellulose nyob rau hauv cov hmoov putty kuj ua rau thixotropy tom qab ntxiv dej rau lub putty. Qhov no thixotropy yog tshwm sim los ntawm kev puas tsuaj ntawm lub loosely ua ke qauv ntawm cov khoom nyob rau hauv lub putty hmoov. Cov qauv no tshwm sim thaum so thiab so hauv kev ntxhov siab. Uas yog hais tias, lub viscosity txo nyob rau hauv stirring, thiab viscosity rov qab thaum sawv ntsug.
3 Vim li cas lub putty kuj hnyav nyob rau hauv cov txheej txheem scraping?
Hauv qhov no, viscosity ntawm cellulose feem ntau siv yog siab dhau. Qee cov neeg tsim khoom siv 200,000 cellulose los ua putty. Lub putty ua nyob rau hauv txoj kev no muaj viscosity siab, yog li nws xav tias hnyav thaum khawb. Qhov pom zoo ntawm putty rau sab hauv phab ntsa yog 3-5 kg, thiab viscosity yog 80,000-100,000.
4 Vim li cas lub putty thiab mortar ua los ntawm cellulose nrog tib lub viscosity txawv nyob rau lub caij ntuj no thiab lub caij ntuj sov?
Vim lub thermal gelation ntawm cov khoom, lub viscosity ntawm cov khoom yuav maj mam txo nrog qhov nce ntawm qhov kub thiab txias. Thaum qhov kub siab tshaj qhov kub ntawm gel ntawm cov khoom, cov khoom yuav raug precipitated los ntawm dej thiab poob nws viscosity. Chav tsev kub nyob rau lub caij ntuj sov yog feem ntau siab dua 30 degrees, uas txawv ntau ntawm qhov kub ntawm lub caij ntuj no, yog li cov viscosity qis dua. Nws raug nquahu kom xaiv cov khoom uas muaj viscosity siab dua thaum siv cov khoom nyob rau lub caij ntuj sov, los yog ua kom cov cellulose nce ntxiv, thiab xaiv cov khoom uas muaj gel kub dua. Sim tsis txhob siv methyl cellulose thaum lub caij ntuj sov, nws cov gel kub nyob ib ncig ntawm 55 degrees, yog tias qhov kub thiab txias me ntsis, nws cov viscosity yuav cuam tshuam zoo heev.
Post lub sij hawm: Nov-26-2022